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| Race (bearing) ： ウィキペディア英語版 |
Race (bearing)
The rolling-elements of a rolling-element bearing ride on races. The large race that goes into a bore is called the ''outer race'', and the small race that the shaft rides in is called the ''inner race''.
== Design ==
In the case of ball bearings, the bearing has inner and outer ''races'' and a set of balls. Each race is a ring with a groove where the balls rest. The groove is usually shaped so the ball is a slightly loose fit in the groove. Thus, in principle, the ball contacts each race at a single point. However, a load on an infinitely small point would cause infinitely high contact pressure. In practice, the ball deforms (flattens) slightly where it contacts each race, much as a tire flattens where it touches the road. The race also dents slightly where each ball presses on it. Thus, the contact between ball and race is of finite size and has finite pressure. Note also that the deformed ball and race do not roll entirely smoothly because different parts of the ball are moving at different speeds as it rolls. Thus, there are opposing forces and sliding motions at each ball/race contact. Overall, these cause bearing drag. "V" groove raceways distribute the load evenly over the balls as they travel on four points of contact, creating a straight line rolling effect and decreasing the amount of friction created by a full contact round groove design.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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